getRegistered(context) throws exception when OctetString is DateTime

I'm setting an OctetString as follows as an SNMP DateTime object

I'm not sure if the way I'm setting the DateTime is correct for SNMP, but when I do a snmpwalk, I'm able to see the variable just fine. Except the program blows up when I call dump_registered()

setup

import struct
import time

# setup the agent as in simple_agent.py example, then

time_millisecs = 1577836800000

# convert milliseconds to an OctetString
value = time.gmtime(time_millisecs / 1000)
value = struct.pack(
                            ">HBBBBBB",
                            value.tm_year,
                            value.tm_mon,
                            value.tm_mday,
                            value.tm_hour,
                            value.tm_min,
                            value.tm_sec,
                            0,
                        )
new_row.setRowCell(2, agent.OctetString(value))

# the above is fine, but it then blows up when the following is called
dump_registered(agent)

stacktrace

Traceback (most recent call last):
  File "./snmp_agent.py", line 465, in <module>
    main()
  File "./snmp_agent.py", line 435, in main
    dump_registered(agent)
  File "./snmp_agent.py", line 342, in dump_registered
    variables = agent.getRegistered(context)
  File "~/my_venv/lib/python3.8/site-packages/netsnmpagent.py", line 949, in getRegistered
    "value": snmpobj.value()
  File "~/my_venv/lib/python3.8/site-packages/netsnmpagent.py", line 895, in value
    retdict[indices][int(data.contents.column)] = u(ctypes.string_at(data.contents.data.string, data.contents.data_len))
  File "~/my_venv/lib/python3.8/site-packages/netsnmpagent.py", line 51, in u
    return s if isinstance("Test", bytes) else s.decode(locale.getpreferredencoding())
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 1: invalid continuation byte
Exception ignored in: <module 'threading' from '/usr/lib/python3.8/threading.py'>
Traceback (most recent call last):
  File "/usr/lib/python3.8/threading.py", line 1388, in _shutdown
    lock.acquire()
KeyboardInterrupt: 
* Cleaning up...

pief / python-netsnmpagent

getRegistered(context) throws exception when OctetString is DateTime #44

setup

stacktrace